fixing inheritance graph: NS_Node -> Node
fixing inheritance graph: NS_Node -> Node

tabo/django-treebeard,tabo/django-treebeard,django-treebeard/django-treebeard,skirsdeda/django-treebeard,tabo/django-treebeard,skirsdeda/django-treebeard,skirsdeda/django-treebeard,django-treebeard/django-treebeard,django-treebeard/django-treebeard,skirsdeda/django-treebeard,tabo/django-treebeard